2. A pigmentprepared from the ink, or black secretion, of
the sepia, or cuttlefish. Treated with caustic potash, it
has a rich brown color; and this mixed with a red forms
{Roman sepia}. Cf. {India ink}, under {India}.
[1913 Webster]

{Sepia drawing} or {Sepia picture}, a drawing in monochrome,
made in sepia alone, or in sepia with other brown
pigments.
[1913 Webster]